Prestressed anchor rod to prevent pulling out of the anchor hole

Abstract

The invention relates to a pre-stressed anchor rod capable of preventing from being pulled out from an anchor eye along an opening. The pre-stressed anchor rod comprises an anchor rod body with the bottom end being provided with an expansion toothed bowl, an expansion plug with the center being provided with an expansion plug center hole, a cushioning table, a cushioning plate and a nut. Anchor rod holes are formed both in the cushioning table and the cushioning plate. The top end of the anchor rod body sequentially penetrates through the expansion plug center hole, the anchor rod hole of the cushioning table and the anchor rod hole of the cushioning plate and then is connected together with the nut. The expansion plug is arranged inside the expansion toothed bowl. The pre-stressed anchor rod is simple in structure, low in cost and convenient to construct, a novel tension-pressure-plug composite pre-stressed anchor system is established, the anchor rod together with a grouting body can be prevented from being pulled out from the anchor eye, and therefore the stability of rock and earth mass, the security of engineering and the durability of anchoring are improved.

Description

technical field [0001] The invention relates to rock-soil anchoring technology, in particular to a prestressed anchor rod which can be smoothly prevented from being pulled out from an anchor hole. Background technique [0002] At present, rock and soil anchoring is through the anchor bolt buried in the stratum, which tightly interlocks the stratum, and relies on the interaction of anchor bolt-grouting body-hole wall rock and soil physical force to mobilize and improve the self-strength of the rock and soil mass and self-stabilizing ability to improve the stress state and ensure the stability of the external rock and soil mass, thereby ensuring the technology of engineering safety. The engineering application of geotechnical anchoring technology began at the end of the 19th century. With the development of its theory and technology, it has been extended to mines, water conservancy, hydropower, highways, railways, municipal administration, urban construction, geology, military...

AI Technical Summary

Problems solved by technology

[0004] During the construction and operation of rock-soil anchorage, the pulling out of the anchor rod together with the grouting body from the anchor hole is the most basic, typical and common form of rock-soil anchorage failure, which will lead to the failure of rock-soil anchorage and endanger the safety of the project. Bring hidden dangers, thereby limiting the anchoring force that the bolt can provide

Therefore, when the rock-soil mass needs to provide a large anchoring force, ordinary bolt anchorage can no longer meet the requirements of the project, which restricts the application and development of rock-soil anchorage technology. How to improve the load transfer mechanism of rock-soil anchorage and overcome the limitations of ordinary anchorage It has become the fundamental way to improve the anchoring force and anchoring effect of the bolt.

[0005] In addition, the grouting body can hardly provide anchoring force in the early stage of anchoring, so it cannot meet the requirements of immediate support after excavation of weak rock and soil

Although the existing pipe-slotted bolts have overcome the above shortcomings, the anchoring force can be provided immediately after the bolt is installed, which is conducive to timely control of the deformation of the rock and soil mass, but the anchoring force that the bolt can provide is not large; at the same time, Due to the weak rock and soil will be squeezed into the pipe cavity from the pipe seam of the pipe seam anchor, resulting in the reduction of anchoring force

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